Answer : The enthalpy change per mole of zinc reacting for the reaction is 152.4 kJ/mol.
Explanation :
First we have to calculate the moles of Zn and HCl.
Molar mass of Zn = 65 g/mole
and,
Now we have to calculate the limiting and excess reagent.
The given chemical reaction is:
From the balanced reaction we conclude that
As, 1 mole of react with 2 mole of
So, 0.0206 moles of react with moles of
From this we conclude that, is an excess reagent because the given moles are greater than the required moles and is a limiting reagent and it limits the formation of product.
Now we have to calculate the enthalpy change per mole of zinc reacting for the reaction.
From the reaction we conclude that,
As, 0.0206 moles of Zn produces heat = 3.14 kJ
So, 1 mole of Zn produces heat =
Therefore, the enthalpy change per mole of zinc reacting for the reaction is 152.4 kJ/mol.